FLEXO-COIL CORDS ROADMASTER's Flexo-Coil electrical cords are water-, oil- and chemical-resistant, and the plugs are injected with silicone to prevent corrosion. Flexo-Coil cords expand to more than eight feet and conveniently retract for storage. They are designed for tow bars without cable channel guides. 4-wire Flexo-Coil cord with plugs and sockets #164